The last time i owned a mac was never lol. I do remember them being the most common computer back when i was younger, but back then i didn't have the money to own a computer. I decided to go for the macbook, which im typing this thread on now. I love this computer. I've only had it for about 3 days. And while i adore the simplicity of the OS, i cant help but to feel a little uncomfortable with the transistion. I have to get use to a lot of new things with Mac os X. Here are a few things that i just didn't understand with the mac, 1, Why does it seem like apps are a lot larger in mac os than in windows. I mean, why is a app take up so much drive space. I bought my laptop with a 80 gig hard drive, and its already down to 50 gigs, I did add 9 gigs of songs and installed microsoft office, and a few other apps like ymessenger and Aim but thats about it, I downloaded the app called "whatSize and i see a lot of used space and i cant seem to get to it to analyze it so i can decide if i will delete it or keep it. I dont know if i have doubles of something or if i delete this app will it screw up my system. Like for example, when i ask WhatSize to analyze my HD drive, i get something like this, 9.01 GB Library 5.80 GB Users 4.36 GB Volumes 4.36 GB Applications 1.66 GB Private 506 MB usr Now i have now clue what Library, Volumes, Private or usr is for, or what it holds in its folders and if it is safe ot delete some or all of it. I know this a newbie questions and i dont mean to waste time, but i hold someone can lend a hand or two to reply to my message and help me understand and fix my problem. Thanks in advance.